There are two values you can look as the render completion times, the thin red and thin blue lines, compared to the end of the loading of actual files. DOMContentLoaded is the vertical blue line and load is represented by the vertical red line.

You can see the exact values by hovering over any request. (See screenshot.)

i never press backspace by accident in a form, but i am used to option left arrow moving back one word at a time, not having the whole page go back. The benefit of backspace is that it works like a backspace when you are in a form element. The damn alt left arrow thing makes you go back no matter what you're doing on a page.

extracts all the selectors from all the stylesheets on the page you're viewing, then analyzes that page to see which of those selectors are not used. The data is then stored so that when testing subsequent pages, selectors can be crossed off the list as they're encountered.

A mozilla magazine forum poster, gensym, described it well on March 8th, 2010:

A concrete example is when the "extended running time of a script" is caused by (or triggered while) a File Save dialog is open: the unresponsive script warning dialog will then pop up logically _behind_ the File Save dialog (at least in Mac OS X, panther (10.3) through leopard (10.5)).

1. [..] on your Mac, navigate to ~/Library/Application Support/Firefox/Profiles.
2. Find your profile folder, which by default should look something like xxxxxxxx.default.
3. Inside your profile folder, find the file called persdict.dat and open it up in your text editor of choice.

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